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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/border-right-width-medium.html 

<!DOCTYPE html>
<html>
<head>
<title>CSS Borders: border-right-width: medium equals 3px</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#border-width">
<link rel="match" href="reference/border-right-width-3px-ref.html">
<meta name="assert" content="The 'thin' keyword for 'border-right-width' is 3px." />
<style>
  div { display: inline-block; height: 100px; }
  .red-if-too-thin { width: 3px; background: red; }
  .cb { position: relative; }
  .red-if-too-thick { width: 20px; background: red; }
  .overlap-red-if-too-thick { width: 20px; background: white; position: absolute; left: 0; }
  .border-test { border-right-style: solid; border-right-width: medium; margin-left: -3px; }
</style>
</head>
<body>
  <p>There should be a black line below and no red.</p>
  <div class=red-if-too-thin></div><!--
  --><div class=cb><!--
    --><div class=border-test></div><!--
    --><div class=red-if-too-thick></div><!--
    --><div class=overlap-red-if-too-thick></div><!--
  --></div>
</body>
</html>